Process of impregnating down with powdered rosin.



Patented Mayf 8, |960.

H. BERGER. PROCESS UF IMPREGNATING DUWN WITH POWDERED BOSIN.

(Application led Aug. 20, 1898.)

(No Mol'iel.)

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UNITED STATES PATENT OFFICE.

HUGO BERGER, OF BERLIN, GERMANY.

PROCESS OF IMPREGNATING DOWN WITH POWDERED ROSIN.

SPECIFICATION forming part of Letters Patent No. 649,232, dated May 8, 1900.

Application iiled August 20, 1898. Serial No. 689,038. (No specimens.)

T0 CLZ whom t may concern:

Be it known that I, HUGO BERGER, a subject of the King of Prussia,Emperor of Germany, residing at Berlin, in the Kingdom of Prussia,German Empire, have invented certain new and useful Improvements inProcesses of Impregnating Down with Powdered Rosin, (for which I haveapplied for patents in Austria, dated July 27, 1898; in Hungary, datedJuly 3l, 1898; in Belgium, dated July 29, 1898; in England, dated July28, 1898, and in Germany, dated January 27, 1898, respectively,) ofwhich the following is a specification.

The ordinary eider and other downs have, as is well known, many defects,owing to which they are useless for filling cases made ofparticularly-fine material; but the chief defect is that the down passesthrough the seams, aswell as through the material, while it cannot beweighed in open receptacles, as the least draft of air scatters the downabout. It has been accordingly necessary to provide better casings forsuch downs, which, however, did not remedy all the above defects, butcaused the featherbeds, eider-down quilts, and the like to be very muchmore expensive. terial of light color, and particularly insomewhat-transparent material, the dark color of the down showed throughand spoiled in this All these defects are remedied by the presentimpregnating process for ordinary down. By this process the down isrendered as valuable as eider-down while the price is much lower thanheretofore. The downs impregnated according to this improved processpass no more through the material, retain their beautiful white color,as wellas their elasticity, and are free from dust, while their actionis not diminished, but increased by the iniiuence of corporal heat'.

Furthermore, in tine silky ma- In the accompanying drawing is shown, byway of example, a drum which is used in carrying the process intopractice.

The impregnation of the down follows in the proportion of ten grams oflight powdered rosin (colophony) in a state resembling flour to onehundred grams of down, and the impregnation takes place in a druma,where in is mounted a shaft c, provided with paddles or vanes. Thedown and the powdered Arosin are thoroughly mixed by the vanes orpaddles, when the drum is heated from below to a temperature of about 40centigrade by means of a perforated gas-pipe l), this heating takingplace while the shaft c is being rapidly rotated with its paddles orvanes.

It is obvious that the heating may be carried on by the aid of steam.

The impregnation of the down obviates the need for the special liningsused for sewed casings, such as had to be used heretofore, and hence thecasings will hereafter be much lighter in weight.

What I claim, and desire to secure by Letters Patent of the UnitedStates, is-

1. The process of treating down for the purpose described, whichconsistsin mixing powdered rosin with the down and gradually heating the mixtureto a temperature of 40 centigrade.

2. The process of treating down for the pur pose described, whichconsists in mixing powdered rosin with the down, applying heat to themixture and simultaneously agitating it.

, In testimony whereof I have hereunto set my hand in the presence oftwo witnesses.

HUGO BERGER.

Witnesses:

HENRY HASPER, C. C. ALBREcHr.

